How do you recognise Japanese holly (Ilex crenata)?

Leaf

Derek Ramsey (Ram-Man), Wikimedia · CC BY-SA 3.0

Japanese holly

Ilex crenata Thunb.

Also known as: Box-leaved holly

Family: Aquifoliaceae

1 to 3 m tall (often clipped low into balls or hedges)

Clipped borders, edgings and topiary; used as a replacement for box affected by box moth and box blight

Flowering: May – June (inconspicuous flowering)

Full sun

Part shade

Hardy to about -20°C

❓ How do you recognise this plant?

Its foliage looks remarkably like that of box, being fine and non-spiny, which makes it the number one horticultural substitute since the arrival of the box tree moth in Europe. Common box has opposite leaves (two by two, facing each other on the stem) and a characteristic smell when crushed, whereas Japanese holly — despite its box-like look — has alternate, odourless leaves, which remains the surest way to tell them apart.

🍃 Leaves

Evergreen, small, ovate, finely toothed but not spiny margin, dark green

🌸 Flowers

Small, white, barely visible

🍎 Fruits

Small black berries, rare on regularly clipped plants

🪵 Bark

Slender twigs, blackish with age

🗺️ Distribution

Native to Japan, Korea and China

🐝 Value for pollinators

Inconspicuous flowering, limited interest

✂️ Horticultural uses

Increasingly replaces common box in topiary and clipped edgings, resistant to box moth

⚠️ Possible toxicity

Leaves and berries toxic if ingested (saponins), generally causing digestive upset (vomiting, diarrhoea) in pets; toxicity comparable to other hollies.

⚠️ Look-alike species

Japanese holly

Ilex crenata

Common box

Buxus sempervirens

Common box has opposite leaves (two by two, facing each other on the stem) and a characteristic smell when crushed, whereas Japanese holly — despite its box-like look — has alternate, odourless leaves, which remains the surest way to tell them apart.

🌿 Other Aquifoliaceae to discover

ℹ️ Educational profile — do not use it to judge whether a plant is edible or safe.

🌱 This database is constantly evolving — species and information are added and corrected regularly. Spotted a mistake? Report it below.